Meaning of “prison” - Learner’s Dictionary

prison

noun [ C, U ] us uk /ˈprɪzən/
Extra Examples
The judge sentenced him to a minimum of five years in prison.He must bear some responsibility for the appalling conditions in the prison.He is concerned about the welfare of young men in prison.She wrote a book detailing her experiences in prison.He was sent to prison for a crime that he didn't commit.

B1 a place where criminals are kept as a punishment:

He's spent most of his life in prison.
She was sent to prison for two years.

(Definition of “prison” from the Cambridge Learner’s Dictionary © Cambridge University Press)